EP1880826B1 - Moulding device for manufacturing thermoplastic containers - Google Patents

Moulding device for manufacturing thermoplastic containers Download PDF

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Publication number
EP1880826B1
EP1880826B1 EP07111931A EP07111931A EP1880826B1 EP 1880826 B1 EP1880826 B1 EP 1880826B1 EP 07111931 A EP07111931 A EP 07111931A EP 07111931 A EP07111931 A EP 07111931A EP 1880826 B1 EP1880826 B1 EP 1880826B1
Authority
EP
European Patent Office
Prior art keywords
support
pin
head
mold
tubular sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07111931A
Other languages
German (de)
French (fr)
Other versions
EP1880826A1 (en
Inventor
Cédric Bianchini
Alexandre Toutoux
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Sidel Participations SAS
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Sidel Participations SAS
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Filing date
Publication date
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Publication of EP1880826A1 publication Critical patent/EP1880826A1/en
Application granted granted Critical
Publication of EP1880826B1 publication Critical patent/EP1880826B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/56—Opening, closing or clamping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C2049/4856—Mounting, exchanging or centering moulds or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C2049/4856—Mounting, exchanging or centering moulds or parts thereof
    • B29C2049/4864—Fixed by a special construction to the mould half carriers, e.g. using insulating material between the mould and the mould half carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/56—Opening, closing or clamping means
    • B29C2049/563—Clamping means
    • B29C2049/5633—Pneumatic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/56—Opening, closing or clamping means
    • B29C2049/563—Clamping means
    • B29C2049/5635—Avoiding mould deformation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/56—Opening, closing or clamping means
    • B29C2049/566—Locking means
    • B29C2049/5661—Mechanical
    • B29C2049/5664—Translating locking pin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B29C33/26—Opening, closing or clamping by pivotal movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
    • B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Definitions

  • the present invention generally relates to the field of molding containers, especially bottles, made of thermoplastic material such as PET by blowing or stretch-blow molding heated preforms, and more specifically relates to improvements made to the mold molding devices.
  • the invention relates to improvements made to the devices for molding containers, in particular bottles, made of thermoplastic material such as PET by blowing or stretch-blow molding heated preforms, which molding devices comprise at least one mold comprising at least two half-molds respectively comprising two supports and two mold blocks defining a joint plane in the closed position of the mold, a sealing compensating chamber being defined between the support and the mold block of a half-mold so that, by injecting a fluid under pressure into the compensation chamber, said mold block is spaced from said support, a plurality of elastic return means and a plurality of abutment means being interposed between said support and said mold block and being arranged so that the absence of fluid under pressure in the compensation chamber, said mold block occupies a retracted position in the support.
  • molding devices comprise at least one mold comprising at least two half-molds respectively comprising two supports and two mold blocks defining a joint plane in the closed position of the mold, a sealing compensating chamber being defined between the support and the mold block of a half-mold
  • FIG. figure 1 A molding device of the type referred to by the invention is shown schematically in FIG. figure 1 attached drawings.
  • the mold designated as a whole by the reference numeral 1 comprises, in the configuration illustrated, two half-molds 2 and 3 respectively adapted to form the entire shoulder, body and bottom of the containers; in another possible configuration, the mold may comprise three elements, namely two half-molds 2 and 3 to form the shoulder and the body of the containers and a mold bottom vertically movable to form the bottom of the containers.
  • the mold 1 is formed of two half-molds 2, 3 which are articulated in rotation relative to each other on an axis 4 (wallet mold) because it is the type of mold the more commonly used in installations produced by the Applicant; but it should be understood that the invention does not exclusively target this type of mold and can find application in molds of other types, including molds in which the half-molds are linearly movable.
  • the half-molds 2, 3 comprise two supports 5, 6 respectively and two mold blocks 7, 8 respectively supported by the latter.
  • the mold blocks have a generally rectangular cross section of substantially general shape.
  • the two mold blocks 7, 8 are hollowed out with two respective molding cavities together forming a molding cavity 11 of axis 12.
  • the two mold blocks 7, 8 have cooperating faces or bearing faces 13 and 14 respectively. , in the mold closing and blowing position, are in mutual abutment along a joint plane P.
  • the supports 5, 6 are arranged so as to have, on one side, respective projecting lugs spaced apart from each other, to which are connected actuating means (opening-closing) generally designated 9, which can be of any suitable configuration and, conversely, closure means in the closed position generally designated 10, which may also have any suitable configuration.
  • actuating means opening-closing
  • a determined of the two half-molds (here the half-mold 2 located on the left on the figure 1 ) is arranged so that between the faces 16, 17 of respective assembly of its support 5 and its block 7 of mold is defined by a seal 18 (housed in a groove 19 dug for example in the face 17 of assembly of the mold block 7), a so-called "clearing chamber” so that said mold block 7 is movable relative to the support 5 substantially perpendicular to its support face 13.
  • the aforementioned assembly faces 16, 17 and the support faces 13, 14 are substantially parallel and the compensation chamber 20 is substantially parallel to the support face 13 of the mold block 7.
  • the wall of the support 5 of the half-mold 2 determined is pierced with a through channel 25 opening into the compensation chamber 20.
  • Channel 25 is connected (not shown) to a source of high pressure fluid.
  • the channel 25 may be connected to the source of the blowing fluid and, in this case, it is arranged that the projection of the surface of the compensation chamber on the joint plane P is greater than the surface. the projection of the molding cavity 11 on said joint plane P.
  • a simple solution illustrated at figure 1 consists in that, to constitute each means 26 of elastic return, a resilient return member 22 is interposed between the head of a bolting member 21 and the outer face 23 of the support 5.
  • the elastic return members 22 may consist of tubular springs in particular monobloc synthetic material (typically polyurethane) for the molds used in cold cycle or by specific stacks of metal spring washers for the molds used in the hot cycle.
  • the mold block 8 (located on the right on the figure 1 ) is fixedly supported by the respective support 6 by means of bolting members 24.
  • stop means adapted to hold the mold block 7 in its retracted position so that the compensation chamber 20 formed between the said faces 16 and 17 of assembly respectively of the support 5 and the mold block 7 is represented by a gap j defined mechanically.
  • Each stop means 27 comprises a stop rod 28 screwed into a bore 29 passing through the support 5.
  • the inner end 30 of the abutment rod 28 bears against the block 7 of the mold; in particular it may be supported, possibly with the interposition of a support plate 32 against the bottom of a recess 31 dug in the mold block 7 substantially coaxially with the bore 29.
  • the rotation of the rod 28 abutment adjusts the value of the interval j .
  • a brake nut 34 may be provided on the free end 33 of the stopper rod 28 to lock it in rotation in the adjustment position.
  • each mold block is of the composite type and comprises a shell provided with the molding impression. and a shell holder supporting said shell and itself supported by the support.
  • the compensation chamber is then provided between the assembly faces of the support and the shell holder, with implementation of elastic return means and abutment means interposed between the support and the mold block.
  • Such molds with a compensation chamber are described in particular in the document FR 2 733 176 in the name of the Applicant, although the presence of elastic return means and abutment means is not explained in this document.
  • a first disadvantage lies in the fact that the support 5 and the mold block 7 of the half-mold 2 comprise, in the embodiment illustrated in the document FR 2,659,265 , eight elastic return means 26 arranged in two columns and four stop means 27, all being located on either side of the compensation chamber 20. These numerous holes and machining mechanically weaken these parts, which are also subject to very high mechanical stresses during blowing.
  • the metal spring washers are assembled in stack form respecting their alternating positioning.
  • practice shows that, during winding operations, washers can be raised in insufficient numbers and / or without respecting their alternating positioning in the stack.
  • the elastic return means can then lose significantly of their effectiveness and it is necessary to restart the elastic return means to complete and / or reposition the spring washers correctly.
  • each disassembly and reassembly of the mold block 7 requires considerable work and requires a lot of adjustment time before the mold is again in proper operating condition.
  • any manufacturing modification involving a change of the mold blocks is very labor-intensive and costly because of the long downtime of the installation.
  • the adjustment of the preload of the elastic return means and the adjustment of the stop are predetermined by the structure of the unitary assembly. Therefore, these settings remain strictly independent of each other and without influence on one another, and no resumption of these adjustments is to be made on the mold during assembly.
  • the tubular sleeve When the mold block is to be separated from the support, the tubular sleeve remains secured to the support without changing its position and the elastic return member remains enclosed in the housing. For its part, the stud remains attached to the mold block. Then, reassembly of the mold block on the support does not cause any change in the physical characteristics of the components, and the securing nut screwed onto the end of the stud is blocked against the second shoulder of the latter by putting the body of the elastic recall in preload automatically to the preset value. The assembler can not make any assembly mistakes and has no adjustments to make, and no component part can be forgotten and / or incorrectly mounted.
  • tubular sleeve it is advantageous for the tubular sleeve to be associated with locking means capable of locking it in rotation relative to the support once the stop adjustment has been effected.
  • locking means of the tubular sleeve it is simple for the locking means of the tubular sleeve to comprise at least one brake nut screwed onto the tubular sleeve and bearing on the support.
  • the elastic return means comprise several spring washers interposed between the head plate of the tubular sleeve and the housing. This avoids the disadvantages associated with synthetic springs.
  • the end of the stud secured to the mold block is screwed into it.
  • the end of the bolt screwed into the mold block is further glued into it.
  • each mold block is of the composite type and comprises a shell provided with the mold cavity and a shell holder supporting said shell and itself supported by the support with a compensation chamber between a support and the associated shell holder as described for example in the documents FR 2 733 176 and FR 2 813 231 in the name of the Claimant.
  • the stud is then secured to the shell holder.
  • the unitary assemblies combining the elastic return means and the abutment means are four in number, which greatly reduces the number of holes in the support and the mold block or the shell holder so that the mechanical strength of these parts is not significantly affected.
  • the arrangements according to the invention are particularly interesting in high-capacity molding machines of the rotating carousel type which are equipped with a multiplicity of molding devices (sometimes several tens) distributed on the periphery of a rotary frame: the change of the mold blocks for a modification of the manufacture of the containers, which was until now a long operation because of the large number of molding devices to be treated, is now revealed, with molding devices arranged according to the invention. invention, much easier and much faster, so that the downtime of the facility is greatly reduced to the great satisfaction of operators.
  • the elastic return means and the stop means are in equal numbers and are respectively combined in pairs as unitary sets.
  • FIG 3A is illustrated such a unitary assembly, designated as a whole by the reference numeral 35, which is arranged as follows.
  • a bore 36 passes through the support 5 outside the compensation chamber (not visible at the figure 3A ) and substantially perpendicular to the joint plane and opens in front of the mold block 7; this bore 36 is threaded at least over part of its length, in particular at 37 in the vicinity of its orifice as shown in FIG. figure 3A .
  • a pin 38 is engaged coaxially through the bore 36 of the support 5 and its inner end 39 is secured to the block 7 of the mold.
  • the stud 38 is provided with a first radial annular shoulder 40 which is turned towards its free end 41 opposite to the aforesaid end 39, which free end 41 remains outside the support 5.
  • the inner end 39 of the stud 38 is screwed into the mold block 7.
  • the mold block 7 comprises a housing 42 located in the continuity of the bore 37 of the support and coaxial thereto, which housing 42 is extended by a tapped bore 43 of smaller diameter than that of the housing 42 so that is defined a shoulder 44 radial annular.
  • the threaded inner end 39 of the stud 38 has a reduced diameter so as to define a radial annular clamping surface 45 on the shoulder 44 when the inner end 39 is screwed into the bore 43.
  • the end 39 of the pin 38 can be further glued into the bore 43.
  • a tubular sleeve 46 is screwed into the threaded portion 37 of the bore 36 of the support 5 so that its inner end E comes into abutment against the first radial shoulder 40 of the stud 38.
  • the tubular sleeve 46 ends. by a head 47 which remains external to the support 5.
  • the head 47 may for example be shaped externally hexagon nut to allow the sleeve 46 to be rotated with a wrench or pliers and is shaped superiorly in the form of a tray 48.
  • a housing 49 is associated with the head 47 of the tubular sleeve 46 and covers at least the plate 48 thereof.
  • the housing 49 is arranged in annular form and surrounds the free end 41 of the stud 38 (more precisely surrounds an enlarged section of the stud defining a second radial annular shoulder 54 which is turned towards the free end 41 of the stud and which will be discussed more precisely further) to be able to undergo an axial displacement of limited amplitude relative to the head 47 of the sleeve 46.
  • retaining means are provided to limit the amplitude of said axial displacement.
  • These retaining means can simply consist of a spring ring or circlip 50 which is retained in a groove in the inner face of the housing 49 and which bears under a flange 51 of the peripheral plate 48 of the head 47 of the sleeve.
  • the elastic return means 22 are interposed between the plate 48 of the head 47 of the tubular sleeve 38 and the casing 49.
  • the elastic return means 22 may comprise a plurality of metal spring washers 52 stacked on top of one another according to the required configuration. stack bearing against the plate 48 and against the housing 49.
  • a nut 53 for precharging the elastic return means 22 is screwed onto the free end 41 of the stud 38 until it abuts against the aforesaid second radial shoulder 54 provided on the stud 38. In this position, the nut 53 carries on the housing 49 and pushes it towards the plate 48 by preloading the spring washers 52.
  • tubular sleeve 46 rotational locking means for locking it relative to the support 5 once abutted against the shoulder 40 of the stud 38.
  • a braking nut 55 screwed onto the tubular sleeve 46 and adapted to be clamped against the outer face 23 of the support 5.
  • the tubular sleeve 46 remains secured to the support 5 without changing its position and the elastic restoring member 52 remains enclosed in the housing 49: this body is not disassembled, there is no risk for a possible faulty reassembly (omission of washers, badly positioned washers).
  • the stud 38 remains secured to the mold block 7.
  • reassembly of the mold block 7 on the support 5 does not involve any change in the physical characteristics of the components.
  • the end E of the tubular sleeve 46 automatically bears against the first shoulder 40 of the stud 38 and the securing nut 53 screwed onto the end 41 of the stud 38 is locked against the latter shoulder 54 of the latter, which sets the elastic return member 52 automatically preloading to the preset value.
  • the assembler can not make any assembly mistakes and has no adjustments to make, and no component part can be forgotten and / or incorrectly mounted.
  • each mold block is of the composite type and comprises a shell provided with the respective mold cavity and a shell holder supporting said shell and itself supported by the support corresponding.
  • the mold block 7 more specifically concerned with the invention comprises the shell 55 and the shell holder 56, while the other mold block 8 comprises the shell 57 and the shell holder 58.
  • Such molds with a chamber compensation are described in particular in the documents FR 2 733 176 and FR 2 813 231 , in the name of the Applicant, to which we can refer.
  • the shell holder 56 which is arranged for compensation as explained above and, at the figure 4 , the same numerical references have been retained to designate the organs or parts identical to those of the figure 3 . More particularly with regard to the provisions of the invention, the bore 42 and the threaded bore 43 are here dug in the shell holder 56, the remainder of the arrangement remaining identical to that described above. above.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Apparatus for producing plastic containers by blow molding comprises two half-molds, one of which has a compensation chamber and a set of return spring-stop units, each comprising a pin that is fixed to the mold block and passes through a hole in the support and has a shoulder towards its free end, a sleeve that is screwed into the hole to contact the shoulder and has a head exterior to the support, a casing that covers the head of the sleeve, a return spring between the head of the sleeve and the casing, and a spring-tensioning nut that is screwed onto the free end of the pin against another shoulder to push back the casing. Apparatus for producing plastic containers by blow molding heated preforms comprises a mold comprising two half-molds, one of which has a compensation chamber for pressurized fluid injection to separate a mold block (7) from a support (5) and a set of return spring-stop units to hold the mold block in a retracted position in the support in the absence of pressurized fluid. Each return spring-stop unit comprises a pin (38) that is fixed to the mold block and passes through a hole in the support and has a shoulder (40) towards its free end, a sleeve (46) that is screwed into the hole to contact the shoulder and has a head exterior to the support, a casing (49) that covers the head of the sleeve, a return spring (22) between the head of the sleeve and the casing, and a spring-tensioning nut (53) that is screwed onto the free end of the pin against another shoulder (54) to push back the casing. An independent claim is also included for a carrousel-type high-speed rotary moulding device comprising several moulds as above mounted on the perimeter of a rotary frame.

Description

La présente invention concerne d'une façon générale le domaine du moulage de récipients, notamment de bouteilles, en matière thermoplastique telle que du PET par soufflage ou étirage-soufflage de préformes chauffées, et elle concerne plus spécifiquement des perfectionnements apportés aux dispositifs de moulage de récipients, notamment de bouteilles, en matière thermoplastique telle que du PET par soufflage ou étirage-soufflage de préformes chauffées, comportant au moins un moule à chambre de compensation.The present invention generally relates to the field of molding containers, especially bottles, made of thermoplastic material such as PET by blowing or stretch-blow molding heated preforms, and more specifically relates to improvements made to the mold molding devices. containers, in particular bottles, made of thermoplastic material such as PET by blowing or stretch-blow molding heated preforms, comprising at least one mold with compensation chamber.

Plus précisément, l'invention concerne des perfectionnements apportés aux dispositifs de moulage de récipients, notamment de bouteilles, en matière thermoplastique telle que du PET par soufflage ou étirage-soufflage de préformes chauffées, lesquels dispositifs de moulage comportent au moins un moule comprenant au moins deux demi-moules comportant respectivement deux supports et deux blocs de moule définissant un plan de joint en position de fermeture du moule, une chambre étanche de compensation étant définie entre le support et le bloc de moule d'un demi-moule de sorte que, par injection d'un fluide sous pression dans la chambre de compensation, ledit bloc de moule soit écarté dudit support, plusieurs moyens de rappel élastique et plusieurs moyens de butée étant interposés entre ledit support et ledit bloc de moule et étant agencés pour qu'en l'absence de fluide sous pression dans la chambre de compensation, ledit bloc de moule occupe une position rétractée dans le support.More specifically, the invention relates to improvements made to the devices for molding containers, in particular bottles, made of thermoplastic material such as PET by blowing or stretch-blow molding heated preforms, which molding devices comprise at least one mold comprising at least two half-molds respectively comprising two supports and two mold blocks defining a joint plane in the closed position of the mold, a sealing compensating chamber being defined between the support and the mold block of a half-mold so that, by injecting a fluid under pressure into the compensation chamber, said mold block is spaced from said support, a plurality of elastic return means and a plurality of abutment means being interposed between said support and said mold block and being arranged so that the absence of fluid under pressure in the compensation chamber, said mold block occupies a retracted position in the support.

Un dispositif de moulage du type visé par l'invention est représenté schématiquement à la figure 1 des dessins annexés.A molding device of the type referred to by the invention is shown schematically in FIG. figure 1 attached drawings.

Le moule désigné dans son ensemble par la référence numérique 1 comprend, dans la configuration illustrée, deux demi-moules 2 et 3 respectivement propres à former l'ensemble de l'épaule, du corps et du fond des récipients ; dans une autre configuration possible, le moule peut comprendre trois éléments, à savoir deux demi-moules 2 et 3 pour former l'épaule et le corps des récipients et un fond de moule mobile verticalement pour former le fond des récipients.The mold designated as a whole by the reference numeral 1 comprises, in the configuration illustrated, two half-molds 2 and 3 respectively adapted to form the entire shoulder, body and bottom of the containers; in another possible configuration, the mold may comprise three elements, namely two half-molds 2 and 3 to form the shoulder and the body of the containers and a mold bottom vertically movable to form the bottom of the containers.

Dans l'exemple illustré, le moule 1 est formé de deux demi-moules 2, 3 qui sont articulés en rotation l'un par rapport à l'autre sur un axe 4 (moule portefeuille) car c'est le type de moule le plus couramment utilisé dans les installations produites par la Demanderesse ; mais il doit être compris que l'invention ne vise pas exclusivement ce type de moule et peut trouver application dans des moules d'autres types, notamment des moules dans lesquels les demi-moules sont mobiles linéairement.In the example shown, the mold 1 is formed of two half-molds 2, 3 which are articulated in rotation relative to each other on an axis 4 (wallet mold) because it is the type of mold the more commonly used in installations produced by the Applicant; but it should be understood that the invention does not exclusively target this type of mold and can find application in molds of other types, including molds in which the half-molds are linearly movable.

Les demi-moules 2, 3 comprennent deux supports 5, 6 respectivement et deux blocs 7, 8 de moule respectivement supportés par ces derniers. Dans l'exemple illustré, les blocs de moule présentent une section droite de forme générale sensiblement rectangulaire. Les deux blocs 7, 8 de moule sont creusés de deux empreintes de moulage respectives formant ensemble une cavité 11 de moulage d'axe 12. Les deux blocs 7, 8 de moule possèdent des faces coopérantes ou faces d'appui respectivement 13 et 14 qui, en position de fermeture du moule et de soufflage, sont en appui mutuel selon un plan de joint P.The half-molds 2, 3 comprise two supports 5, 6 respectively and two mold blocks 7, 8 respectively supported by the latter. In the example illustrated, the mold blocks have a generally rectangular cross section of substantially general shape. The two mold blocks 7, 8 are hollowed out with two respective molding cavities together forming a molding cavity 11 of axis 12. The two mold blocks 7, 8 have cooperating faces or bearing faces 13 and 14 respectively. , in the mold closing and blowing position, are in mutual abutment along a joint plane P.

Les supports 5, 6 sont agencés de manière à présenter, d'un côté, des oreilles saillantes respectives écartées l'une de l'autre, auxquelles sont raccordés des moyens d'actionnement (ouverture - fermeture) désignés globalement en 9, qui peuvent être de toute configuration appropriée et, à l'opposé, des moyens de verrouillage en position de fermeture désignés globalement en 10, qui peuvent eux aussi avoir toute configuration appropriée.The supports 5, 6 are arranged so as to have, on one side, respective projecting lugs spaced apart from each other, to which are connected actuating means (opening-closing) generally designated 9, which can be of any suitable configuration and, conversely, closure means in the closed position generally designated 10, which may also have any suitable configuration.

Un déterminé des deux demi-moules (ici le demi-moule 2 situé à gauche sur la figure 1) est agencé de manière qu'entre les faces 16, 17 d'assemblage respectives de son support 5 et de son bloc 7 de moule soit définie, par un joint 18 (logé dans une gorge 19 creusée par exemple dans la face 17 d'assemblage du bloc 7 de moule), une chambre 20 étanche dite "chambre de compensation" et de manière que ledit bloc 7 de moule soit déplaçable par rapport au support 5 sensiblement perpendiculairement à sa face 13 d'appui. Dans la configuration de moule de forme sensiblement quadrangulaire illustrée à titre d'exemple sur la figure 1, les faces 16, 17 d'assemblage précitées et les faces 13, 14 d'appui sont sensiblement parallèles et la chambre 20 de compensation est sensiblement parallèle à la face 13 d'appui du bloc 7 de moule.A determined of the two half-molds (here the half-mold 2 located on the left on the figure 1 ) is arranged so that between the faces 16, 17 of respective assembly of its support 5 and its block 7 of mold is defined by a seal 18 (housed in a groove 19 dug for example in the face 17 of assembly of the mold block 7), a so-called "clearing chamber" so that said mold block 7 is movable relative to the support 5 substantially perpendicular to its support face 13. In the mold configuration of substantially quadrangular shape illustrated by way of example on the figure 1 , the aforementioned assembly faces 16, 17 and the support faces 13, 14 are substantially parallel and the compensation chamber 20 is substantially parallel to the support face 13 of the mold block 7.

La paroi du support 5 du demi-moule 2 déterminé est percée d'un canal 25 traversant débouchant dans la chambre 20 de compensation. Le canal 25 est raccordé (non montré) à une source de fluide sous haute pression. De façon pratique, le canal 25 peut être raccordé à la source de fluide de soufflage et, dans ce cas, on fait en sorte que la projection de la surface de la chambre 20 de compensation sur le plan P de joint soit supérieure à la surface de la projection de la cavité 11 de moulage sur ledit plan P de joint. Lors du soufflage, sous l'action de la pression régnant dans la chambre 20 de compensation, le bloc 7 de moule est repoussé en direction du bloc 8 de moule en vis-à-vis et sa face 13 d'appui est fortement pressée contre la face 14 d'appui du bloc 8 de moule.The wall of the support 5 of the half-mold 2 determined is pierced with a through channel 25 opening into the compensation chamber 20. Channel 25 is connected (not shown) to a source of high pressure fluid. Conveniently, the channel 25 may be connected to the source of the blowing fluid and, in this case, it is arranged that the projection of the surface of the compensation chamber on the joint plane P is greater than the surface. the projection of the molding cavity 11 on said joint plane P. When blowing, under the action of the pressure prevailing in the compensation chamber 20, the mold block 7 is pushed towards the block 8 of the mold vis-à-vis and its bearing face 13 is strongly pressed against the bearing face 14 of the block 8 of mold.

Une fois le soufflage terminé, pour assurer le rappel du bloc 7 de moule dans sa position rétractée au fond du support 5 respectif, on prévoit que le bloc 7 de moule soit supporté par le support 5 respectif par l'intermédiaire de moyens 26 de rappel élastique. Une solution simple illustrée à la figure 1 consiste en ce que, pour constituer chaque moyen 26 de rappel élastique, un organe 22 de rappel élastique soit interposé entre la tête d'un organe 21 de boulonnage et la face externe 23 du support 5. Les organes 22 de rappel élastique peuvent consister en des ressorts tubulaires notamment monoblocs en matière synthétique (typiquement en polyuréthane) pour les moules utilisés en cycle froid ou par des empilements précis de rondelles ressorts métalliques pour les moules utilisés en cycle chaud.Once the blowing is completed, to ensure the return of the mold block 7 in its retracted position at the bottom of the respective support 5, it is expected that the mold block 7 is supported by the respective support 5 via means 26 reminder elastic. A simple solution illustrated at figure 1 consists in that, to constitute each means 26 of elastic return, a resilient return member 22 is interposed between the head of a bolting member 21 and the outer face 23 of the support 5. The elastic return members 22 may consist of tubular springs in particular monobloc synthetic material (typically polyurethane) for the molds used in cold cycle or by specific stacks of metal spring washers for the molds used in the hot cycle.

De son côté, le bloc 8 de moule (situé à droite sur la figure 1) est supporté de façon fixe par le support 6 respectif par l'intermédiaire d'organes 24 de boulonnage.For its part, the mold block 8 (located on the right on the figure 1 ) is fixedly supported by the respective support 6 by means of bolting members 24.

Un moule agencé comme il vient d'être décrit en référence à la figure 1 des dessins annexés est divulgué dans le document FR 2 659 265 (la figure 1 des dessins annexés étant reprise de la figure 1 de ce document), auquel on pourra se reporter pour des explications plus complètes.A mold arranged as just described with reference to the figure 1 attached drawings is disclosed in the document FR 2,659,265 (the figure 1 the attached drawings being taken from the figure 1 of this document), which can be referred to for more complete explanations.

Toutefois, ce document omet de mentionner et de représenter des moyens de butée propres à maintenir le bloc 7 de moule, dans sa position rétractée, de manière que la chambre 20 de compensation formée entre les susdites faces 16 et 17 d'assemblage respectivement du support 5 et du bloc 7 de moule soit représentée par un intervalle j défini mécaniquement.However, this document fails to mention and represent stop means adapted to hold the mold block 7 in its retracted position so that the compensation chamber 20 formed between the said faces 16 and 17 of assembly respectively of the support 5 and the mold block 7 is represented by a gap j defined mechanically.

A la figure 2 des dessins joints est illustré de façon séparée un exemple de réalisation des moyens 27 de butée dont le moule 1 est équipé. Chaque moyen 27 de butée comprend une tige 28 de butée vissée dans un alésage 29 traversant le support 5. L'extrémité 30 intérieure de la tige 28 de butée vient en appui contre le bloc 7 de moule ; notamment elle peut être en appui, éventuellement avec interposition d'une plaquette 32 d'appui, contre le fond d'un évidement 31 creusé dans le bloc 7 de moule sensiblement coaxialement à l'alésage 29. La rotation de la tige 28 de butée permet d'ajuster la valeur de l'intervalle j. Un écrou 34 de freinage peut être prévu sur l'extrémité 33 libre de la tige 28 de butée pour la bloquer en rotation dans la position de réglage.To the figure 2 attached drawings is shown separately an embodiment of the stop means 27 of which the mold 1 is equipped. Each stop means 27 comprises a stop rod 28 screwed into a bore 29 passing through the support 5. The inner end 30 of the abutment rod 28 bears against the block 7 of the mold; in particular it may be supported, possibly with the interposition of a support plate 32 against the bottom of a recess 31 dug in the mold block 7 substantially coaxially with the bore 29. The rotation of the rod 28 abutment adjusts the value of the interval j . A brake nut 34 may be provided on the free end 33 of the stopper rod 28 to lock it in rotation in the adjustment position.

Bien entendu, les dispositions qui viennent d'être exposées ont été reconduites, de façon tout particulièrement intéressante, dans les moules couramment fabriqués par la Demanderesse dans lesquels chaque bloc de moule est de type composite et comprend une coquille munie de l'empreinte de moulage et un porte-coquille supportant ladite coquille et lui-même supporté par le support. La chambre de compensation est alors prévue entre les faces d'assemblage du support et du porte-coquille, avec mise en oeuvre de moyens de rappel élastique et de moyens de butée interposés entre le support et le bloc de moule. De tels moules avec chambre de compensation sont décrits notamment dans le document FR 2 733 176 au nom de la Demanderesse, bien que la présence de moyens de rappel élastique et de moyens de butée ne soit pas explicitée dans ce document.Of course, the arrangements which have just been described have been extended, in a particularly interesting way, in the molds currently manufactured by the Applicant in which each mold block is of the composite type and comprises a shell provided with the molding impression. and a shell holder supporting said shell and itself supported by the support. The compensation chamber is then provided between the assembly faces of the support and the shell holder, with implementation of elastic return means and abutment means interposed between the support and the mold block. Such molds with a compensation chamber are described in particular in the document FR 2 733 176 in the name of the Applicant, although the presence of elastic return means and abutment means is not explained in this document.

Quel que soit le type de moule considéré, bien que cet agencement connu donne toute satisfaction en fonctionnement, il présente toutefois plusieurs inconvénients.Whatever the type of mold considered, although this known arrangement is satisfactory in operation, however, it has several disadvantages.

Un premier inconvénient réside dans le fait que le support 5 et le bloc 7 de moule du demi-moule 2 comportent, dans le mode de réalisation illustré dans le document FR 2 659 265 , des moyens 26 de rappel élastique au nombre de huit disposés en deux colonnes et des moyens 27 de butée au nombre de quatre, tous étant situés de part et d'autre de la chambre 20 de compensation. Ces nombreux perçages et usinages affaiblissent mécaniquement ces pièces par ailleurs soumises à des contraintes mécaniques très importantes lors du soufflage.A first disadvantage lies in the fact that the support 5 and the mold block 7 of the half-mold 2 comprise, in the embodiment illustrated in the document FR 2,659,265 , eight elastic return means 26 arranged in two columns and four stop means 27, all being located on either side of the compensation chamber 20. These numerous holes and machining mechanically weaken these parts, which are also subject to very high mechanical stresses during blowing.

Dans des fabrications ultérieures, le nombre des moyens de rappel élastique a été ramené à quatre ; mais le nombre total des perçages reste encore élevé.In later fabrications, the number of elastic return means has been reduced to four; but the total number of holes remains high.

Dans tous les cas, le démontage, puis le remontage du bloc 7 de moule (par exemple pour un changement de fabrication avec une cavité de moulage différente) nécessite de démonter, puis de remonter les nombreux moyens de rappel élastique et moyens de butée.In all cases, disassembly and reassembly of the mold block 7 (for example for a manufacturing change with a different molding cavity) requires disassembly and then reassemble the numerous elastic return means and stop means.

Surtout, un autre inconvénient important réside dans le fait qu'à chaque remontage il est nécessaire de refaire les réglages de la précontrainte de rappel et de butée pour chacun des moyens concernés. Or il s'avère que le réglage des moyens de butée dérègle systématiquement le réglage des moyens de rappel élastique pour la compensation, ce qui exige des reprises alternées de ces réglages.Above all, another important disadvantage lies in the fact that at each reassembly it is necessary to redo the adjustments of the preload of return and stop for each of the means concerned. However, it turns out that the adjustment of the stop means systematically decelerates the setting of the elastic return means for the compensation, which requires alternating occasions of these settings.

Au surplus, les ressorts en matière synthétique utilisés dans les dispositifs de moulage fonctionnant en cycle froid perdent progressivement leur élasticité et finissent par s'avachir, ce qui exige leur remplacement régulier.In addition, the synthetic springs used in molding devices operating in the cold cycle gradually lose their elasticity and end up becoming stale, which requires regular replacement.

De leur côté, les rondelles ressorts métalliques sont assemblées sous forme d'empilement en respectant leur positionnement alterné. Or la pratique montre que, lors des opérations de remontage, des rondelles peuvent être remontées en nombre insuffisant et/ou sans respecter leur positionnement alterné dans l'empilement. De ce fait, les moyens de rappel élastique peuvent alors perdre notablement de leur efficacité et on est conduit à redémonter les moyens de rappel élastique pour compléter et/ou repositionner correctement les rondelles ressorts.For their part, the metal spring washers are assembled in stack form respecting their alternating positioning. However, practice shows that, during winding operations, washers can be raised in insufficient numbers and / or without respecting their alternating positioning in the stack. As a result, the elastic return means can then lose significantly of their effectiveness and it is necessary to restart the elastic return means to complete and / or reposition the spring washers correctly.

Finalement, en pratique chaque démontage, puis remontage du bloc 7 de moule exige un travail considérable et nécessite beaucoup de temps de réglage avant que le moule soit à nouveau en état de fonctionnement correct. Dans une installation de moulage de grande capacité du type carrousel tournant incorporant un grand nombre de moules (par exemple jusqu'à 34 moules), toute modification de fabrication impliquant un changement des blocs de moule est très contraignante en travail et en coût en raison de la longue durée d'immobilisation de l'installation.Finally, in practice each disassembly and reassembly of the mold block 7 requires considerable work and requires a lot of adjustment time before the mold is again in proper operating condition. In a large rotating molding carousel molding installation incorporating a large number of molds (for example up to 34 molds), any manufacturing modification involving a change of the mold blocks is very labor-intensive and costly because of the long downtime of the installation.

Il existe donc de la part des exploitants de telles installations de moulage une demande pressante pour que ces inconvénients soient écartés, ou tout au moins fortement atténués, afin que les conditions d'exploitation de ces installations puissent être substantiellement améliorées.There is therefore a pressing demand from the operators of such molding plants that these disadvantages be avoided, or at least greatly reduced, so that the operating conditions of these installations can be substantially improved.

A ces fins, l'invention propose un dispositif de moulage de récipients, notamment de bouteilles, en matière thermoplastique telle que du PET par soufflage ou étirage-soufflage de préformes chauffées, lequel dispositif de moulage comporte au moins un moule comprenant au moins deux demi-moules comportant respectivement deux supports et deux blocs de moule définissant un plan de joint en position de fermeture du moule, une chambre étanche de compensation étant définie entre le support et le bloc de moule d'un demi-moule de sorte que, par injection d'un fluide sous pression dans la chambre de compensation, ledit bloc de moule soit écarté dudit support, plusieurs moyens de rappel élastique et plusieurs moyens de butée étant interposés entre ledit support et ledit bloc de moule et étant agencés pour qu'en l'absence de fluide sous pression dans la chambre de compensation, ledit bloc de moule occupe une position rétractée dans le support,
caractérisé en ce que lesdits moyens de rappel élastique et lesdits moyens de butée sont en nombres égaux et sont combinés respectivement deux à deux sous forme d'ensembles unitaires comprenant chacun :

  • un alésage traversant le support à l'extérieur de la chambre de compensation et sensiblement perpendiculairement au plan de joint et débouchant en regard du bloc de moule,
  • un goujon traversant coaxialement ledit alésage du support et ayant une extrémité solidarisée au bloc de moule, ledit goujon comportant un premier épaulement annulaire radial tourné vers son extrémité libre,
  • un manchon tubulaire vissé dans ledit alésage de manière que son extrémité intérieure prenne appui sur ledit premier épaulement radial du goujon, ledit manchon tubulaire ayant une tête extérieure au support qui définit un plateau d'appui,
  • un boîtier coiffant ladite tête du manchon tubulaire et propre à un déplacement axial d'amplitude limitée par rapport à ladite tête du manchon,
  • des moyens de rappel élastique interposés entre la tête du manchon tubulaire et le boîtier, et
  • un écrou de mise en précharge des moyens de rappel élastique qui est vissé sur l'extrémité libre du goujon, en repoussant le boîtier contre un second épaulement radial dudit goujon.
For these purposes, the invention provides a device for molding containers, in particular bottles, made of thermoplastic material such as PET by blowing or stretch-blow molding heated preforms, which molding device comprises at least one mold comprising at least two half-molds respectively comprising two supports and two mold blocks defining a joint plane in the closed position of the mold, a sealing compensating chamber being defined between the support and the mold block of a half-mold so that, by injecting a fluid under pressure into the compensation chamber, said mold block is spaced from said support, a plurality of elastic return means and a plurality of abutment means being interposed between said support and said mold block and being arranged so that the absence of fluid under pressure in the compensation chamber, said mold block occupies a retracted position in the support,
characterized in that said elastic return means and said abutment means are in equal numbers and are respectively combined in pairs as unitary units each comprising:
  • a bore passing through the support outside the compensation chamber and substantially perpendicular to the joint plane and opening opposite the mold block,
  • a stud coaxially passing through said bore of the support and having an end secured to the mold block, said stud having a first radial annular shoulder turned towards its free end,
  • a tubular sleeve screwed into said bore so that its inner end bears on said first radial shoulder of the stud, said tubular sleeve having a head outside the support which defines a support plate,
  • a casing covering said head of the tubular sleeve and capable of axial displacement of limited amplitude with respect to said head of the sleeve,
  • resilient return means interposed between the head of the tubular sleeve and the housing, and
  • a nut for precharging the elastic return means which is screwed onto the free end of the stud, by pushing the housing against a second radial shoulder of said stud.

Grâce à cet agencement, le réglage de la précharge des moyens de rappel élastique et le réglage de la butée sont prédéterminés par la structure de l'ensemble unitaire. De ce fait, ces réglages demeurent strictement indépendants l'un de l'autre et sans influence l'un sur l'autre, et aucune reprise de ces réglages n'est à effectuer sur le moule lors du montage.Thanks to this arrangement, the adjustment of the preload of the elastic return means and the adjustment of the stop are predetermined by the structure of the unitary assembly. Therefore, these settings remain strictly independent of each other and without influence on one another, and no resumption of these adjustments is to be made on the mold during assembly.

Lorsque le bloc de moule doit être séparé du support, le manchon tubulaire demeure solidaire du support sans modification de sa position et l'organe de rappel élastique demeure enfermé dans le boîtier. De son côté, le goujon demeure solidaire du bloc de moule. Ensuite, le remontage du bloc de moule sur le support n'entraîne aucune modification des caractéristiques physiques des composants, et l'écrou de solidarisation vissé sur l'extrémité du goujon est bloqué contre le second épaulement de ce dernier en mettant l'organe de rappel élastique en précharge automatiquement à la valeur préétablie. L'ouvrier monteur ne peut commettre aucune erreur d'assemblage et n'a aucun réglage à effectuer, et aucune pièce composante ne peut être oubliée et/ou mal montée.When the mold block is to be separated from the support, the tubular sleeve remains secured to the support without changing its position and the elastic return member remains enclosed in the housing. For its part, the stud remains attached to the mold block. Then, reassembly of the mold block on the support does not cause any change in the physical characteristics of the components, and the securing nut screwed onto the end of the stud is blocked against the second shoulder of the latter by putting the body of the elastic recall in preload automatically to the preset value. The assembler can not make any assembly mistakes and has no adjustments to make, and no component part can be forgotten and / or incorrectly mounted.

Il est avantageux qu'au manchon tubulaire soient associés des moyens de blocage propres à le bloquer en rotation par rapport au support une fois le réglage de butée effectué. En pratique, il est simple que les moyens de blocage du manchon tubulaire comprennent au moins un écrou de freinage vissé sur le manchon tubulaire et prenant appui sur le support.It is advantageous for the tubular sleeve to be associated with locking means capable of locking it in rotation relative to the support once the stop adjustment has been effected. In practice, it is simple for the locking means of the tubular sleeve to comprise at least one brake nut screwed onto the tubular sleeve and bearing on the support.

Du fait de la simplification des opérations de démontage/montage à laquelle conduit l'agencement conforme à l'invention, il devient possible que, systématiquement quelle que soit l'utilisation prévue pour le moule, les moyens de rappel élastique comprennent plusieurs rondelles ressorts métalliques interposées entre le plateau de la tête du manchon tubulaire et le boîtier. On évite ainsi les inconvénients associés aux ressorts en matière synthétique.Due to the simplification of disassembly / assembly operations to which the arrangement according to the invention leads, it becomes possible that, systematically regardless of the use provided for the mold, the elastic return means comprise several spring washers interposed between the head plate of the tubular sleeve and the housing. This avoids the disadvantages associated with synthetic springs.

Dans un exemple pratique de réalisation qui est simple de structure et de fabrication, l'extrémité du goujon solidarisée au bloc de moule est vissée dans celui-ci. De plus, par mesure de sécurité, on peut prévoir que l'extrémité du goujon vissée dans le bloc de moule est en outre collée dans celui-ci.In a practical embodiment which is simple in structure and fabrication, the end of the stud secured to the mold block is screwed into it. In addition, for safety reasons, it can be provided that the end of the bolt screwed into the mold block is further glued into it.

Les dispositions conformes à l'invention qui viennent d'être exposées trouvent application dans tous les types de moule à chambre de compensation. A ce titre, les dispositions en question peuvent notamment être mises en oeuvre de façon intéressante dans les moules aujourd'hui couramment fabriqués par la Demanderesse dans lesquels chaque bloc de moule est de type composite et comprend une coquille munie de l'empreinte de moulage et un porte-coquille supportant ladite coquille et lui-même supporté par le support avec chambre de compensation entre un support et le porte-coquille associé comme décrit par exemple dans les documents FR 2 733 176 et FR 2 813 231 au nom de la Demanderesse. Le goujon est alors solidarisé au porte-coquille.The provisions according to the invention which have just been described find application in all types of mold compensation chamber. As such, the provisions in question can be implemented in interesting ways in the molds currently commonly manufactured by the Applicant in which each mold block is of the composite type and comprises a shell provided with the mold cavity and a shell holder supporting said shell and itself supported by the support with a compensation chamber between a support and the associated shell holder as described for example in the documents FR 2 733 176 and FR 2 813 231 in the name of the Claimant. The stud is then secured to the shell holder.

De préférence, les ensembles unitaires combinant les moyens de rappel élastique et les moyens de butée sont au nombre de quatre, ce grâce à quoi on réduit considérablement le nombre des perçages pratiqués dans le support et le bloc de moule ou le porte-coquille de sorte que la résistance mécanique de ces pièces n'est pas sensiblement affectée.Preferably, the unitary assemblies combining the elastic return means and the abutment means are four in number, which greatly reduces the number of holes in the support and the mold block or the shell holder so that the mechanical strength of these parts is not significantly affected.

Les dispositions conformes à l'invention se révèlent tout particulièrement intéressantes dans les installations de moulage de grande capacité du type carrousel tournant qui sont équipées d'une multiplicité de dispositifs de moulage (parfois plusieurs dizaines) répartis sur la périphérie d'un bâti rotatif : le changement des blocs de moule en vue d'une modification de fabrication des récipients, qui était jusqu'à présent une opération longue en raison du grand nombre de dispositifs de moulage à traiter, se révèle maintenant, avec des dispositifs de moulage agencés selon l'invention, beaucoup plus facile et beaucoup plus rapide, de sorte que la durée d'immobilisation de l'installation est considérablement réduite à la grande satisfaction des exploitants.The arrangements according to the invention are particularly interesting in high-capacity molding machines of the rotating carousel type which are equipped with a multiplicity of molding devices (sometimes several tens) distributed on the periphery of a rotary frame: the change of the mold blocks for a modification of the manufacture of the containers, which was until now a long operation because of the large number of molding devices to be treated, is now revealed, with molding devices arranged according to the invention. invention, much easier and much faster, so that the downtime of the facility is greatly reduced to the great satisfaction of operators.

L'invention sera mieux comprise à la lecture de la description détaillée qui suit de certains modes de réalisation préférés donnés uniquement à titre d'exemples nullement limitatifs. Dans cette description, on se réfère aux dessins annexés sur lesquels :

  • la figure 1 est une vue schématique de dessus d'un moule agencé conformément à l'état de la technique, seuls les moyens de rappel élastique d'un des blocs de moule étant visibles ;
  • la figure 2 est une vue en coupe de côté d'une partie du moule de la figure 1 montrant les moyens de butée associés audit bloc de moule ;
  • les figures 3A et 3B sont des vues partielles de côté, en coupe et partiellement extérieure, d'un mode de réalisation préféré d'un ensemble unitaire conforme à l'invention monté dans un moule du type de celui de la figure 1 et montré respectivement dans la situation assemblée et dans la situation désassemblée du moule ; et
  • la figure 4 est une vue partielle de côté, en coupe et partiellement extérieure, du même mode de réalisation préféré de l'ensemble unitaire conforme à l'invention monté dans un moule de type différent.
The invention will be better understood on reading the following detailed description of certain preferred embodiments given solely by way of non-limiting examples. In this description, reference is made to the accompanying drawings in which:
  • the figure 1 is a schematic top view of a mold arranged according to the state of the art, only the elastic return means of one of the mold blocks being visible;
  • the figure 2 is a side sectional view of a part of the mold of the figure 1 showing the abutment means associated with said mold block;
  • the Figures 3A and 3B are partial side views, partly sectional and partly external, of a preferred embodiment of a unitary assembly according to the invention mounted in a mold of the type of that of the figure 1 and shown respectively in the assembled situation and in the disassembled situation of the mold; and
  • the figure 4 is a partial side view, in section and partially external, of the same preferred embodiment of the unitary assembly according to the invention mounted in a different type of mold.

On se reportera tout d'abord à la figure 3A sur laquelle les mêmes références numériques qu'aux figures 1 et 2 ont été conservées pour désigner les mêmes organes. A la figure 3A seules sont montrées, par souci de clarté, une portion du support 5 et une portion en correspondance du bloc 7 de moule.We will first refer to the figure 3A on which the same numerical references as figures 1 and 2 have been retained to designate the same organs. To the figure 3A only a portion of the support 5 and a portion corresponding to the mold block 7 are shown for the sake of clarity.

Conformément à l'invention, les moyens de rappel élastique et les moyens de butée sont en nombres égaux et sont combinés respectivement deux à deux sous forme d'ensembles unitaires. A la figure 3A est illustré un tel ensemble unitaire, désigné dans son ensemble par la référence numérique 35, qui est agencé de la façon suivante.According to the invention, the elastic return means and the stop means are in equal numbers and are respectively combined in pairs as unitary sets. To the figure 3A is illustrated such a unitary assembly, designated as a whole by the reference numeral 35, which is arranged as follows.

Un alésage 36 traverse le support 5 à l'extérieur de la chambre de compensation (non visible à la figure 3A) et sensiblement perpendiculairement au plan de joint et débouche devant le bloc 7 de moule ; cet alésage 36 est taraudé au moins sur une partie de sa longueur, notamment en 37 au voisinage de son orifice comme montré à la figure 3A.A bore 36 passes through the support 5 outside the compensation chamber (not visible at the figure 3A ) and substantially perpendicular to the joint plane and opens in front of the mold block 7; this bore 36 is threaded at least over part of its length, in particular at 37 in the vicinity of its orifice as shown in FIG. figure 3A .

Un goujon 38 est engagé coaxialement à travers l'alésage 36 du support 5 et son extrémité 39 intérieure est solidarisée au bloc 7 de moule. Le goujon 38 est muni d'un premier épaulement 40 annulaire radial qui est tourné vers son extrémité 41 libre, opposée à la susdite extrémité 39 intérieure, laquelle extrémité 41 libre reste extérieure au support 5. De façon pratique comme montré à la figure 3A, l'extrémité 39 intérieure du goujon 38 est vissée dans le bloc 7 de moule. Dans l'exemple concret de réalisation illustré, le bloc 7 de moule comporte un logement 42 situé dans la continuité de l'alésage 37 du support et coaxial à celui-ci, lequel logement 42 se prolonge par un alésage 43 taraudé de diamètre moindre que celui du logement 42 de sorte qu'est ainsi défini un épaulement 44 annulaire radial. De son côté, l'extrémité 39 intérieure, filetée, du goujon 38 possède un diamètre réduit de manière à définir une portée 45 annulaire radiale de serrage sur l'épaulement 44 lorsque l'extrémité 39 intérieure est vissée dans l'alésage 43. De préférence, par mesure de précaution, l'extrémité 39 du goujon 38 peut en outre être collée dans l'alésage 43.A pin 38 is engaged coaxially through the bore 36 of the support 5 and its inner end 39 is secured to the block 7 of the mold. The stud 38 is provided with a first radial annular shoulder 40 which is turned towards its free end 41 opposite to the aforesaid end 39, which free end 41 remains outside the support 5. Conveniently as shown in FIG. figure 3A the inner end 39 of the stud 38 is screwed into the mold block 7. In the concrete exemplary embodiment illustrated, the mold block 7 comprises a housing 42 located in the continuity of the bore 37 of the support and coaxial thereto, which housing 42 is extended by a tapped bore 43 of smaller diameter than that of the housing 42 so that is defined a shoulder 44 radial annular. For its part, the threaded inner end 39 of the stud 38 has a reduced diameter so as to define a radial annular clamping surface 45 on the shoulder 44 when the inner end 39 is screwed into the bore 43. Preferably, as a precautionary measure, the end 39 of the pin 38 can be further glued into the bore 43.

Un manchon 46 tubulaire est vissé dans la partie 37 taraudée de l'alésage 36 du support 5 de manière que son extrémité E intérieure vienne en butée contre le premier épaulement 40 radial du goujon 38. A son extrémité opposée, le manchon 46 tubulaire se termine par une tête 47 qui reste extérieure au support 5. La tête 47 peut par exemple être conformée extérieurement en écrou six pans pour permettre de faire tourner le manchon 46 à l'aide d'une clé ou d'une pince et elle est conformée supérieurement sous forme d'un plateau 48.A tubular sleeve 46 is screwed into the threaded portion 37 of the bore 36 of the support 5 so that its inner end E comes into abutment against the first radial shoulder 40 of the stud 38. At its opposite end, the tubular sleeve 46 ends. by a head 47 which remains external to the support 5. The head 47 may for example be shaped externally hexagon nut to allow the sleeve 46 to be rotated with a wrench or pliers and is shaped superiorly in the form of a tray 48.

Un boîtier 49 est associé à la tête 47 du manchon 46 tubulaire et coiffe au moins le plateau 48 de celle-ci. Le boîtier 49 est agencé sous forme annulaire et entoure l'extrémité 41 libre du goujon 38 (plus précisément entoure un tronçon élargi du goujon définissant un second épaulement 54 annulaire radial qui est tourné vers l'extrémité 41 libre du goujon et dont il sera question plus précisément plus loin) pour être à même de subir un déplacement axial d'amplitude limitée par rapport à la tête 47 du manchon 46. A cet effet, des moyens de retenue sont prévus pour limiter l'amplitude dudit déplacement axial. Ces moyens de retenue peuvent de façon simple consister en une bague ressort ou circlip 50 qui est retenu dans une gorge pratiquée dans la face interne du boîtier 49 et qui prend appui sous un rebord 51 périphérique du plateau 48 de la tête 47 du manchon.A housing 49 is associated with the head 47 of the tubular sleeve 46 and covers at least the plate 48 thereof. The housing 49 is arranged in annular form and surrounds the free end 41 of the stud 38 (more precisely surrounds an enlarged section of the stud defining a second radial annular shoulder 54 which is turned towards the free end 41 of the stud and which will be discussed more precisely further) to be able to undergo an axial displacement of limited amplitude relative to the head 47 of the sleeve 46. For this purpose, retaining means are provided to limit the amplitude of said axial displacement. These retaining means can simply consist of a spring ring or circlip 50 which is retained in a groove in the inner face of the housing 49 and which bears under a flange 51 of the peripheral plate 48 of the head 47 of the sleeve.

Les moyens 22 de rappel élastique sont interposés entre le plateau 48 de la tête 47 du manchon 38 tubulaire et le boîtier 49. Les moyens 22 de rappel élastique peuvent comprendre plusieurs rondelles ressorts 52 métalliques empilées les unes sur les autres selon la configuration requise, l'empilement prenant appui contre le plateau 48 et contre le boîtier 49.The elastic return means 22 are interposed between the plate 48 of the head 47 of the tubular sleeve 38 and the casing 49. The elastic return means 22 may comprise a plurality of metal spring washers 52 stacked on top of one another according to the required configuration. stack bearing against the plate 48 and against the housing 49.

Enfin, un écrou 53 de mise en précharge des moyens 22 de rappel élastique est vissé sur l'extrémité 41 libre du goujon 38 jusqu'à venir en butée contre le susdit second épaulement 54 radial prévu sur le goujon 38. Dans cette position, l'écrou 53 porte sur le boîtier 49 et le repousse en direction du plateau 48 en préchargeant les rondelles ressorts 52.Finally, a nut 53 for precharging the elastic return means 22 is screwed onto the free end 41 of the stud 38 until it abuts against the aforesaid second radial shoulder 54 provided on the stud 38. In this position, the nut 53 carries on the housing 49 and pushes it towards the plate 48 by preloading the spring washers 52.

Par mesure de sécurité, on peut avantageusement associer au manchon 46 tubulaire des moyens de blocage en rotation permettant de le bloquer par rapport au support 5 une fois mis en butée contre l'épaulement 40 du goujon 38. De façon simple, on peut à cet effet prévoir un écrou 55 de freinage vissé sur le manchon 46 tubulaire et propre à être serré contre la face 23 externe du support 5.As a safety measure, can be advantageously associated with the tubular sleeve 46 rotational locking means for locking it relative to the support 5 once abutted against the shoulder 40 of the stud 38. In a simple way, it is possible to Indeed, provide a braking nut 55 screwed onto the tubular sleeve 46 and adapted to be clamped against the outer face 23 of the support 5.

Grâce à l'agencement de l'ensemble unitaire 35 conforme à l'invention qui vient d'être décrit de façon détaillée en regard de la figure 3A, le réglage de la précharge des moyens 22 de rappel élastique et le réglage de la butée E/40 sont prédéterminés par la structure de l'ensemble unitaire 35. De ce fait, ces réglages demeurent strictement indépendants l'un de l'autre et sans influence l'un sur l'autre, et aucune reprise de ces réglages n'est à effectuer sur le moule lors du montage.Thanks to the arrangement of the unitary unit 35 according to the invention which has just been described in detail with regard to the figure 3A , setting the preload of the elastic return means 22 and the adjustment of the stop E / 40 are predetermined by the structure of the unitary assembly 35. As a result, these adjustments remain strictly independent of one another and without influence one on the other, and no resumption of these adjustments is to be made on the mold during assembly.

Lorsque le bloc de moule doit être séparé du support comme montré à la figure 3B, le manchon 46 tubulaire demeure solidaire du support 5 sans modification de sa position et l'organe 52 de rappel élastique demeure enfermé dans le boîtier 49 : cet organe n'étant pas démonté, il n'y a aucun risque pour un possible remontage défectueux (omission de rondelles, rondelles mal positionnées). De son côté, le goujon 38 demeure solidaire du bloc 7 de moule.When the mold block is to be separated from the support as shown in figure 3B , the tubular sleeve 46 remains secured to the support 5 without changing its position and the elastic restoring member 52 remains enclosed in the housing 49: this body is not disassembled, there is no risk for a possible faulty reassembly (omission of washers, badly positioned washers). For its part, the stud 38 remains secured to the mold block 7.

Ensuite, le remontage du bloc 7 de moule sur le support 5 n'entraîne aucune modification des caractéristiques physiques des composants. L'extrémité E du manchon 46 tubulaire vient automatiquement porter contre le premier épaulement 40 du goujon 38 et l'écrou 53 de solidarisation vissé sur l'extrémité 41 du goujon 38 est bloqué contre le second épaulement 54 de ce dernier, ce qui met l'organe 52 de rappel élastique en précharge automatiquement à la valeur préétablie. Le monteur ne peut commettre aucune erreur d'assemblage et n'a aucun réglage à effectuer, et aucune pièce composante ne peut être oubliée et/ou mal montée.Then, reassembly of the mold block 7 on the support 5 does not involve any change in the physical characteristics of the components. The end E of the tubular sleeve 46 automatically bears against the first shoulder 40 of the stud 38 and the securing nut 53 screwed onto the end 41 of the stud 38 is locked against the latter shoulder 54 of the latter, which sets the elastic return member 52 automatically preloading to the preset value. The assembler can not make any assembly mistakes and has no adjustments to make, and no component part can be forgotten and / or incorrectly mounted.

La mise en oeuvre des dispositions qui viennent d'être décrites semble devoir se révéler tout particulièrement intéressante dans les moules à structure composite aujourd'hui couramment installés par la Demanderesse dans les installations de soufflage ou d'étirage-soufflage qu'elle fabrique. Comme montré à la figure 4, il s'agit essentiellement de moules de forme générale cylindrique dans lesquels chaque bloc de moule est de type composite et comprend une coquille munie de l'empreinte de moulage respective et un porte-coquille supportant ladite coquille et lui-même supporté par le support correspondant. Ainsi, le bloc 7 de moule plus spécifiquement concerné par l'invention comprend la coquille 55 et le porte-coquille 56, tandis que l'autre bloc 8 de moule comprend la coquille 57 et le porte-coquille 58. De tels moules avec chambre de compensation sont décrits notamment dans les documents FR 2 733 176 et FR 2 813 231 , au nom de la Demanderesse, auquel on pourra se reporter. Dans le contexte de l'invention, c'est alors le porte-coquille 56 qui est aménagé en vue de la compensation comme exposé plus haut et, à la figure 4, on a conservé les mêmes références numériques pour désigner les organes ou parties identiques à ceux de la figure 3. Plus particulièrement pour ce qui concerne les dispositions propres à l'invention, l'alésage 42 et l'alésage taraudé 43 sont ici creusés dans le porte-coquille 56, le reste de l'agencement demeurant identique à ce qui a été décrit ci-dessus.The implementation of the provisions just described seems to be particularly interesting in the composite structure molds now commonly installed by the applicant in blow molding or stretch blow molding it manufactures. As shown in figure 4 it is essentially molds of generally cylindrical shape in which each mold block is of the composite type and comprises a shell provided with the respective mold cavity and a shell holder supporting said shell and itself supported by the support corresponding. Thus, the mold block 7 more specifically concerned with the invention comprises the shell 55 and the shell holder 56, while the other mold block 8 comprises the shell 57 and the shell holder 58. Such molds with a chamber compensation are described in particular in the documents FR 2 733 176 and FR 2 813 231 , in the name of the Applicant, to which we can refer. In the context of the invention, it is then the shell holder 56 which is arranged for compensation as explained above and, at the figure 4 , the same numerical references have been retained to designate the organs or parts identical to those of the figure 3 . More particularly with regard to the provisions of the invention, the bore 42 and the threaded bore 43 are here dug in the shell holder 56, the remainder of the arrangement remaining identical to that described above. above.

Claims (9)

  1. Device for moulding containers, especially bottles, made from thermoplastic, such as PET, by blow-moulding or stretch-blow-moulding heated preforms, which moulding device includes at least one mould (1) comprising at least two half-moulds (2, 3) respectively comprising two supports (5, 6) and two mould blocks (7, 8) defining a parting plane (P) in the closed position of the mould, a leak-tight compensating chamber (20) being defined between the support (5) and the mould block (7) of one half-mould (2) in such a manner that, due to a pressurized fluid being injected into the compensating chamber (20), said mould block (7) is moved apart from said support (5), a plurality of elastic return means (26) and a plurality of abutment means (27) being interposed between said support (5) and said mould block (7) and being arranged such that, in the absence of pressurized fluid in the compensating chamber (20), said mould block (7) is in a retracted position in the support (5),
    characterized in that said elastic return means (26) and said abutment means (27) are equal in number and are combined respectively in pairs in the form of unitary assemblies (35) each comprising:
    - a bore (36) extending through the support (5) on the outside of the compensating chamber (20) and substantially perpendicularly to the parting plane (P) and opening opposite the mould block (7),
    - a pin (38) passing coaxially through said bore (36) of the support (5) and having one end (39) secured to the mould block (7), said pin (38) comprising a first radial annular shoulder (40) facing the free end (41) thereof,
    - a tubular sleeve (46) screwed into said bore (36) such that the inner end (E) thereof bears on said first radial shoulder (40) of the pin (38), said tubular sleeve (46) having a head (47) which is external to the support (5) and which defines a bearing plate (48),
    - a housing (49) capping said head (47) of the tubular sleeve (46) and adapted for an axial displacement with a limited amplitude with respect to said head (47) of the sleeve,
    - elastic return means (26) interposed between the head (47) of the tubular sleeve (46) and the housing (49), and
    - a nut (53) for preloading the elastic return means (26), which is screwed on the free end (41) of the pin (38) against a second radial shoulder (54) of said pin, while pushing the housing (49)
    whereby the setting of the preload of the elastic return means and the setting of the abutment remain independent of one another and without any influence on one another and are predetermined by the two radial shoulders of the pin (38).
  2. Moulding device according to Claim 1, characterized in that with the tubular sleeve (46) blocking means are associated which are suitable for blocking it in rotation with respect to the support (5), once the abutment setting has been carried out.
  3. Moulding device according to Claim 2, characterized in that the means for blocking the tubular sleeve (46) comprise at least one lock nut (55) screwed on the tubular sleeve (38) and bearing on the support (5).
  4. Moulding device according to any one of Claims 1 to 3, characterized in that the elastic return means (26) comprise a plurality of metallic spring washers (52) interposed between the head (47) of the tubular sleeve (46) and the housing (49).
  5. Moulding device according to any one of Claims 1 to 4, characterized in that that end (39) of the pin (38) which is secured to the mould block (7) is screwed therein.
  6. Moulding device according to Claim 5, characterized in that the end (39) of the pin (38) which is screwed in the mould block (7) is, furthermore, adhesively bonded therein.
  7. Moulding device according to any one of Claims 1 to 6, characterized in that each mould block (7, 8) is of the composite type comprising a shell (55, 57) provided with a moulding recess and a shell carrier (56, 58) supporting said shell (55, 57) and itself supported by the support (5, 6), and in that the pin (38) is secured to the shell carrier (56).
  8. Moulding device according to any one of Claims 1 to 7, characterized in that the unitary assemblies (35) combining the elastic return means and the abutment means are four in number.
  9. High-performance rotary moulding device of the carousel type comprising a multiplicity of moulds distributed peripherally on a rotary framework, characterized in that each mould is designed according to any one of Claims 1 to 8.
EP07111931A 2006-07-21 2007-07-06 Moulding device for manufacturing thermoplastic containers Not-in-force EP1880826B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0606716A FR2903933B1 (en) 2006-07-21 2006-07-21 MOLDING DEVICE FOR MANUFACTURING THERMOPLASTIC CONTAINERS

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EP1880826A1 EP1880826A1 (en) 2008-01-23
EP1880826B1 true EP1880826B1 (en) 2009-04-29

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US (1) US7753670B2 (en)
EP (1) EP1880826B1 (en)
JP (1) JP4584290B2 (en)
CN (1) CN101108536B (en)
AT (1) ATE430013T1 (en)
DE (1) DE602007001003D1 (en)
ES (1) ES2326048T3 (en)
FR (1) FR2903933B1 (en)
MX (1) MX2007008812A (en)
PT (1) PT1880826E (en)

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FR3002479B1 (en) * 2013-02-28 2015-03-27 Sidel Participations "DEVICE FOR CONTROLLING A COMPENSATION CHAMBER OF A MOLDING UNIT OF CONTAINERS"
FR3011763B1 (en) 2013-10-14 2015-12-11 Sidel Participations "MOLDING UNIT FOR THE MANUFACTURE OF CONTAINERS HAVING A COMPENSATION CLAMP"
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CN105058749B (en) * 2015-07-31 2017-05-03 江苏新美星包装机械股份有限公司 Connecting structure between mold and mold base in bottle blowing machine
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IT201800001700A1 (en) * 2018-01-23 2019-07-23 Gea Procomac Spa APPARATUS AND PROCESS FOR ASEPTIC FORMING OF CONTAINERS STARTING FROM PREFORMS IN THERMOPLASTIC MATERIAL

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JP2008030479A (en) 2008-02-14
ES2326048T3 (en) 2009-09-29
FR2903933B1 (en) 2008-10-03
DE602007001003D1 (en) 2009-06-10
PT1880826E (en) 2009-07-31
MX2007008812A (en) 2009-01-07
ATE430013T1 (en) 2009-05-15
JP4584290B2 (en) 2010-11-17
FR2903933A1 (en) 2008-01-25
EP1880826A1 (en) 2008-01-23
CN101108536B (en) 2011-12-28
US20080020085A1 (en) 2008-01-24
CN101108536A (en) 2008-01-23
US7753670B2 (en) 2010-07-13

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